Fix caching method
Fix caching method

PyBossa/pybossa,OpenNewsLabs/pybossa,geotagx/geotagx-pybossa-archive,OpenNewsLabs/pybossa,stefanhahmann/pybossa,inteligencia-coletiva-lsd/pybossa,proyectos-analizo-info/pybossa-analizo-info,geotagx/geotagx-pybossa-archive,CulturePlex/pybossa,Scifabric/pybossa,geotagx/geotagx-pybossa-archive,jean/pybossa,CulturePlex/pybossa,proyectos-analizo-info/pybossa-analizo-info,PyBossa/pybossa,Scifabric/pybossa,harihpr/tweetclickers,inteligencia-coletiva-lsd/pybossa,proyectos-analizo-info/pybossa-analizo-info,geotagx/geotagx-pybossa-archive,geotagx/pybossa,geotagx/pybossa,harihpr/tweetclickers,stefanhahmann/pybossa,geotagx/geotagx-pybossa-archive,jean/pybossa,CulturePlex/pybossa